天然气水合物饱和度碳氧比测井的解释模型

Carbon oxygen ratio logging interpretation model of natural gas hydrate saturation

为定量评价天然气水合物饱和度,提出一种基于能窗计数比的碳氧比测井解释模型。采用蒙特卡罗数值模拟技术,研究了砂岩储层碳氧能窗计数比与孔隙度和天然气水合物饱和度的关系,建立了天然气水合物饱和度碳氧比测井解释模型并确定了模型参数。结果表明:孔隙度大于15%、天然气水合物饱和度大于20%的砂岩储层有利于进行碳氧比测井;基于碳氧能窗计数比建立的解释模型能够定量确定砂岩储层天然气水合物饱和度,误差小,精度高。

This paper proposes a carbon oxygen ratio logging interpretation model based on the energy window count ratio and able to quantitatively evaluate the natural gas hydrate saturation.The study involves investigating the relationship between sandstone reservoir carbon oxygen energy window count ratio and porosity and natural gas hydrate saturation using monte carlo numerical simulation technology;establishing natural gas hydrate saturation carbon oxygen ratio logging interpretation model and determining the model parameters.The results show that the sandstone reservoir with porosity greater than 15%and natural gas hydrate saturation greater than 20%are beneficial for carbon oxygen ratio logging.The interpretation model based on carbon oxygen energy window count ratio enables the determination of the saturation of natural gas hydrate with small error and high accuracy quantitatively.